Rotary pump.



PATENTBDTNOV.' 1.7, 1903'.

T. T. JOHNSTON.

ROTARY PUMP. APPLIOATION HLED AUG. a. TOOz.V

N0 MODEL NO.V744,352.

PATBNTEO NOV. 17, 1903. T. T. JOHNSTON.

ROTARY PUMP.

APPLICATION FILED AUG. 8, 1902.

2 SHEETS-SHEET 2.

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IIIII N0 MODEL.

UNITED STATES Patented November 17, 1903.

-PATENT OFFICE.

ROTARY PUMP.

r$1?ECLFICA'LIOBT forming part of VLetters Patent No. 744,352, datedNovember 17, 1903.

Y Application led August 8. 1902.

i" 0 m15 whom it' may concern.-

Be it known that I, THoMAsTAYLoR JOHN- STON, a citizen of the UnitedStates, residing at Evanston, a suburb of the city of Chicago, in thecounty of Cook and State of Illinois, have invented a new and usefulRotary Pump, of which the following is a specification in its best formnow known to me, reference being had to the accompanying drawings, inwhich similar numerals indicate the same parts throughout the severalviews.

' My invention relates to rotary pumps. Its object is to provide a pumpof compact form for use in small spaces, which can be easily and lcheaply constructed, which shall be efficient in operation, and notlikely to get out of order.

It consists in such a pump having means for automatically cooling thebearings and for maintaining constant the flow of liquid pumped.v

It consists in a novel form of air-chamber and the combination of itwith the pump and in many details of construction and arrange- Amenthereinafter more fully described and claimed.

In the drawings, Figure 1 isa side, and.Fig.j 2 a plan, View of amachine embodying my invention. Figs. 3, 4, and 5 aresectional detailyviews taken on lines 3 4 5 of Fig. 2. Fig. 6 is aj detailed view of amodilied form of construe-py tion, showing air-chambers on both suctionand discharge sides of the pump. i

Referring again to thedrawings, 11indi cates the outer casing of themachine, Vmade.

vpreferably of ordinary pipe' and Vfrequently tions 18 and 19, cut awayin curves 20 and 2l, having their centers inthe centers of the twoshafts 14 and l5 and their radii equal to they greatest lengthof animpeller lobe or arm. As the impellers rotate the outer portion of atleast one lobe or arm will be close enough Ato the lining 12 to affordpumping ability.

Serial No.- 118,910. (No model.)

The raised portions 18 and 19 are of sufficient length so that, as showninV Fig. 5, at least one of the impell'er lobes or arms will always beadjacent to the lining 12. If the outer case is a special one, insteadof a'pipe these portions 12 inclosingv the impellers may be madedirectly on the inside of the case itself instead of on the liningsecured thereto. The essential thing is that the lining should inclosethe impellers a sufficient that they can pump. l I

Fitted against the ends 24` and 25 of the lining 12 and in contiguitywith the ends of the impellers are end plates 26 and 27, eachA fillingthe cross-section of the pipe 1l and being secured thereto by means ofscrews or pins 28., Integral with these end plates 26 and 27 arethejournal-bearings 30 and 31, in which the shafts 14 and 15 rest, beingheld in position by the caps 32 and33, held in p0- sition by bolts 34and 35, respectively. End plate 26 has cut in one edge between theprojections 18 and 19, heretofore described, an opening 36, largeenoughto admit a sufficient supply of water into chamber 46 on one side`of theV impellers, and ,in thecnd plate-27, but

on' the 'opposite side of the pipe or case', isa similarjopening 37,affordingan exit from chamber 47.

distance so The shafts 14 and l5 are geared together l by pinions 38and39 and maybe similarly geared at both ends,if desired,and oneshaftV as,for 'instance,14is extended'outside of -the vmechanism vjustdescribedAand ,has connected to it an' electric motor or other suitable sourceof, power. Assuming that the pump is of the form shown in Figs. 1 and 2,the impeller mechanism may be at the bottom of a pipe many hundreds offeetin length and the shaft extend up the pipe to themetor above ground.If the shaft is thus very long, the shaft should of course be supportedat various points along the pipe.

In. order to provide anair-chamber` when the pump is used below ground,I insertinsidethe pipe 11a (which is merely an extension of pipe 11,secured to it by the coupling 40) a short piece of pipe 41,the samebeing secured in position by means of the inside coupscribed. Ifdesired, a duplicate construction may be placed inside of the pipesupplying the water, the open end of space 48 being placed away from thepump.

When the pump is to be used above ground or elsewhere where there isplenty of room, I attach to the two water-chambers 46 and 47 adjacent tothe openings 36 and 37, respectively, a pair of air-chambers 44 and 45,one of which keeps the iniiow of water constant while the otherregulates the outflow. These air-chambers regulate the pressure of waterin the same manner that similar chambers act on fire-engines.

In the operation of my invention I place the pump illustrated in thedrawings with its lower end, Figs. 1 and 2, connected with the source ofwater which is to be pumped and start the power which rotates shaft 15,thereby, through pinions 38 and 39, rotating the impellers 16 and 17.This motion of the impellers pumps water up around the bearings 32,thence through the opening 36 into the chamber 46, thence through theimpellers in the usual manner into chamber 47, the impeller bladesdriving the water before them as they pass along the portions 18 andl9,respectively,of thelining. From chamber 47 the water is forced upthrough opening 37 around bearings 3l 33, thence up through pipe 4l, andon, up, and out through. pipe 11, the air-space 48 acting as anair-chamber in the usual manner to take up the irregularity of action ofthe pump.

In practice I preferably make the bearings 30 32 and 31 33 oflignum-vitae and, as shown, omit all oil-cups and stufng-boxes. As theconstruction described allows the flowing water, both incoming andoutgoing, to pass over and around the bearings, they are kept perfectlycool at all times.

I have in practice run a pump embodying my invention at a speed of threehundred revolutions per minute for six months at a continuous stretch,same showing ninety per cent. eciency by actual test. By thisconstruction I am able to insert the pump directly in the pipe of a welland lower it to any desired depth by simply lengthening the pipe. Thepump is perfectly reversible and may be made to run in either direction.

I do not wish to be limited to the exact details of construction, whichmay be varied within reasonable limits without departing from myinvention.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. In a rotary pump, the combination of a cylindrical case,preferably anordinary waterpipe, a pair of cross-partitions in said pipe or case eachhaving an opening adapted to admit the passage of liquid which is to bepumped, said openings being on approximately opposite sides of the pipe,a pair of rotatable shafts with their axes parallel to the axis of thewater-pipe, a pair of impellers in pumping relation with each othermounted on said shafts between said cross-partitions, projections insideof the pipe between said partitions closely inelosing said impellersover a sucient distance to permit the impellers to pump, said inclosingportions being on approximately opposite portions of the circumferenceof the pipe and so located as not to obstruct the passage of waterthrough said openings in the partitions and means for applying power toone of said shafts.

2. In a rotary pump, the combination of a cylindrical case preferably anordinary waterpipe, a pair of cross-partitions in said case or pipe eachhaving an opening adapted to admit the passage of liquid which is to bepumped, said openings being on approximately the opposite sides of thepump, a pair of rotatable shafts with their axes parallel to the axis ofthe waterpipe,apairofimpellersinpumpingrelation with each other mountedon said shafts between said cross-partitions, a detachable liningsecured to the inside of the pipe between said partitions closelyinclosing said impellers over a suicient distance to permit theimpellers to pump, said inclosing portions being on approximatelyopposite portions of the circumference of the pipe and so located as notto obstruct the passage of water through said openings in the partitionsand means for applying power to one of said shafts.

3. In a rotary pump, the combination of a cylindrical case,preferably anordinary waterpipe, a pair of cross-partitions in said case or pipe eachhaving an opening adapted to admit the passage of liquid which is to bepumped, said openings being on approximately opposite sides of the pipe,a pair of rotatable shafts with their axes parallel to the axis of thewater-pipe, a pair of impellers in pumping relation with each othermounted on said shafts between said cross-partitions, projections insideof the pipe between said partitions closely inclosing said impellersover a suiicient distance to permit the impellers to pump, saidinclosing portions being on approximately opposite portions of the eircum ference of the pipe and so located as not to obstruct the passage ofwater through said openings in the partitions, means for applying powerto one of said shafts and an air-chamber inside the discharge-pipe withits mouth in proximity to the discharge-opening of the pump.

4. In a rotary pump, the combination of a cylindrical case,preferably anordinary waterpipe, a pair of cross-partitions in said case or pipe eachhaving an opening adapted to admit the passage of liquid whichis to bepumped, said openings being on approximately opposite sides of the pipe,a pair of rotatable shafts, with their axes parallel to the axis of thewater-pipe, a pair of impellers in pumping relation with each othermounted on said shafts between said cross-partitions, projections insidethe pipe between said partitions and inclosing said impellers over a ICOIIO

sufficient distance to permit the impellers to pump, said inclosingportions being .on approximately opposite portions of the pipe and solocated as not to obstruct the passage of water through said openings inthe partitions, means for applying power to one of said shafts and asmaller pipe 46 secured inside the main discharge-pipe so as to form anairchamber 48 with its mouth in proximity to the discharge-opening ofthe pump.

5. In a rotary pump the combination of a cylindrical case preferably anordinary waterpipe, a pair of cross-partitions in said pipe or case eachhaving an opening adapted to admit the passage of liquid which is to bepumped, Said openings being on approximately opposite sides of the pipe,a pair of rotatable shafts with their axes parallel to the axis of thewater-pipe .passing through said cross-partitions and journaled outsidethereof, a pair of impellers in pumping relation with each other mountedon said shafts between said cross-partitions, projections inside of thepipe between said partitions closely inclosing said impellers over asufficient distance to permit the impellers to pump, said inclosingportions being on approximately opposite portions of the circumferenceof the pipe and so located as notto obstruct the passage of waterthrough said openings inthe partitions and means for applying power toone of said shafts.

6. In a rotary pump, the combination of an ordinary water-pipe, a pairof cross-partitions in said pipe, each having an opening adapted toadmit the passage of liquid which is to be pumped, said openings beingon the opposite' `sides of the pipe, a pair of shafts passing throughsaid cross-partitions and journaled outside thereof, a pair of impellersmounted on the said shafts between the said cross-partitions, a liningsecured to the inside of the pipe and closely inclosing said impellersover asufcient distance to permit the said impellers to pump, saidinclosing portions being in the opposite portions of the circumferenceof the pipe between the liquid-supply openings in the cross-partitions,pinions on said shafts adapted to cause the said impellers to rotate inthe opposite directions and means for applying power to one shaft, forthe purposes set forth. Y

7, In a rotary pump, the combination of an ordinary pipe, a pair ofcross-partitions in the said pipe,.eacl1 having an opening adapted' toadmit the passage of liquid which is to be pumped, said openings beingon the opposite sides of the pipe, a pair of shafts through the saidcross-partitions and journaled outside thereof, a pair of impellersmounted on shafts between the said partitions, a liningsecured to theinside of the pipe and closely inclosing said impellers over asufficient distance to permit the said impellers to pump, said inclosingportions being in the opposite portions of the circumference of pipebetween the liquid-supply openings in the cross-partitions, pinions onsaid shafts adapted to cause said impellers to rotate inthe oppositedirections, means for applying power to one of said shafts, and anair-chamber inside the discharge-pipe with its mouthA in proximity tothe discharge-opening of the pump.

8. In a rotary pump, the combination of an ordinary water-pipe, a pairof cross-partitions in the said pipe, each having an opening adapted toadmit the passage of liquid to be pumped said openings being on theopposite sides of pipe, a pair of shafts passing through thecross-partitions and journaled outside thereof, a pair of impellersmounted on the said shafts between the cross-partitions, a

lining secured to the inside of said pipe and closely inclosing saidimpellers over a sufficient distance to permit said impellers to pump,said inclosing portions being in the opposite portions of thecircumference of the pipe between the"liquidsupply openings in thecross-partitions, pinions on said shafts adapted to cause the saidimpellers to rotate in opposite directions, means for applying power toone of the shafts, and a smaller pipe 41, secured inside the maindischarge-pipe, so as to form au air-chamber 48, withits mouth inproximity to the discharge-opening of the pump.

THOMAS TAYLOR JOHNSTON.

Witnesses:

GEO. C. DAVIsoN, DWIGHT B. CHEEVER.

